It's a very common word used to warn about potential harm or hazards.
Here are some examples of how it's used:
* "Kuna hatari ya mvua" - There is a danger of rain.
* "Huyu ni mtu hatari" - This is a dangerous person.
* "Epuka hatari" - Avoid danger.
You can also use "hatari" as an adjective to describe something that is dangerous:
* "Njia hii ni hatari" - This road is dangerous.
* "Kunywa pombe ni hatari" - Drinking alcohol is dangerous.